/Engine/Source/Runtime/Engine/Public/Animation/AnimCurveTypes.h
Mirror the values & flags of the two named curves if both exist. If only InName0 exists, InName0 will be renamed to InName1. If only InName1 exists, InName1 will be renamed to InName0.
void Mirror ( [FName](API\Runtime\Core\UObject\FName) InName0, [FName](API\Runtime\Core\UObject\FName) InName1 )